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(No Model.)

L. K. JOHNSON.

BURGLAR ALARM.

No. 392,805. Patented Nov. 18, 1888.

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LOUIS K. JOHNSON, OF BROOKLYN, NEW YORK.

BURGLAR ALARM.

SPECIFICATION forming part of Letters Patent No. 392,805, dated November13, 1888.

Application filed February 14, 1888. Serial No. 264,025. (No model.)

To aZZ whom it may concern:

Be it known that I, Louis K. Johnson, a citizen of the United States,residing in the city of Brooklyn, in the county of Kings and State ofNew York,have invented certain new and useful Improvements inBurglar-Alarms, of which the following is a specification, sufficient toenable others to make and use the same.

The object of myinvention is to afford cheap and effective mechanism forgiving notice of any tampering with doors or windows to which the devicemay be connected, the ap paratus being adapted for either temporary orpermanent application to an apartment or series of apartments.

The main feature of my invention consists in the special constructionand arrangement, as hereinafter set forth,of a spring-bolt arranged withrelation to a percussion-cap or cartridge set in such manner that whenan attempt is made to open a door or window to which the device isapplied the bolt will be released and will fire the fulminate or otherexplosive Incidentally my invention also includes the combination, withthe springbolt, of a tension-wire or suspender to which one or morealarm-bells are attached,the release of the bolt setting in vibrationthe bells, which are presumably situated in more remote portions of thebuilding.

In the accompanying drawings I illustrate operative mechanism forcarrying out my improvements, although I do not wish to confine myselfstrictly to the identical form and construction of parts herein shownand described, since it is obvious that various modifications may bemade without deviating materially from the essential features of myinvcntion.

Figure 1 represents the arrangement of the apparatus in connection witha door, and Fig. 2 represents the device as applied to a window.

It is obviously immaterial whether the boltplate A is attached to thedoor or to its jamb, or to which sash of a window it is secured whenapplied to the latter.

In Fig. l of the drawings the bolt-plate A is shown as attached to theinner side of the door, while the catch-plate is secured to the jamb.

In Fig. 2 the bolt-plate A is secured to the top of the lower sash, andthe catch-plate a to the lower bar of the upper sash.

The bolt-plate A is formed with a flange or hearing, a which isperforated to receive the cylindrical portion of the cartridge B, theonlarged rim b of which holds it in position. The

plate A is also formed with a bolt-standard, (0*, through which the bolt0 slides longitudinall The outer end of the bolt 0 is formed with ashoulder, c, which engages with the catchplate a upon the jamb of thedoor or upon the opposite sash, as the case may be.

The spiral spring S is arranged upon the bolt 0 in such manner as totend constantly to project the inner end, a", of the bolt against thecap or cartridge B.

In the extreme outer end of the bolt G a small book or recess, 0, isformed for the purpose of affording engagement with a vertical bolt, D,attached to the lower end of the suspender E, which is conducted to anydesired portion of the building, and is held taut by a retractile springor springs, F. At a suitable point intermediate between the bolt D andthe spring F alarm-bells G are connected with the suspcnder E in suchmanner that when the bolt 0 is released from any cause, thereby allowingthe retractile spring F to suddenly pull the suspender E and bolt Dupward, the bells G will be agitated, more or less,and assist in givingthe necessary alarm.

The bolt 0 is released either by the opening of the door or windowcarrying the shoulder 0 beyond the catch-plate a, or in the case of thedoor by a cam or projection, H, situated upon the door-knob spindle I,which, when the latter is turned, raises the bolt 0 sufficiently toclear the said catch-plate a. In either case the spring S causes theend'a of the bolt to come violently in contact with the cap or cartridgeB and discharge it.

\Vhat I claim, and desire to secure by Let ters Patent, is-

l. A burglar-alarm for windows and doors, consisting of a bolt-plate, A,provided with a cartridge-holder, a cartridge B, bolt-standard a, bolt0, and spring S, arranged upon the door or window sash, in combinationwith a catch-plate, a, arranged upon the door or window frame in suchrelation to the spring bolt Gas to hold the latter away from thecartridge when the door or window is closed and to release the said boltagainst the cartridge when the door or window is opened, substantiallyin the manner and for the purpose described.

2. In a burglar-alarm for doors and win- (lows, substantially such asherein shown and described, the eombination,with the bolt plate A,attached to a door and provided with a cartridge-holder, a, cartridge B,holtstaudard a", bolt 0, and spring S, and with a catch-plate arrangedupon the door-frame in such relation to the spring-bolt as to hold thelatter away from the cartridge when the door is closed, 01' a door-knobspindle, l, formed with a lateral projection, II, by which thespringbolt C may be released from the catch-plate a, substan tially inthe manner and for the purpose described.

3. In a burglar-alarm for doors and windows, the combination, with thebolt-plate A, arranged upon a door or window sash and provided with acartridge-holder, a cartridge B, bolt-standard a, bolt 0, and spring S,and with a catch-plate, a, arranged upon the door or window fraineinsuch relation to the springbolt 0 as to hold the latter away from thecartridge when the door or window is closed and to release the said boltagainst the said cartridge when the door or window is opened, of acatch-bolt, 1), arranged to engage with the said spring-bolt O, andattached to a suspender, E, provided with a retractile spring, F, andconnected with an alarm-bell, G, situated in different compartment forthe purpose, and arranged and operating substantially in the manner setforth.

LOUIS K. JOHNSON. lVitnesses:

GEO. W. Mm'rrr, D. W. GARDNER.

